1734-APB
1734-APB
1734-APB
热继电器是利用电流的热效应原理实现电机的过载保护的。
电动机在工作时,当负载过大、电压过低或发生一相断路故障时,电动机的电流都要增大,其值往往过额定电流。如果过不多,电路中熔断器的熔体不会熔断,但时间长了会影响电动机的寿命,甚至烧毁电动机,因此需要有过载保护。热继电器用于电动机的过载保护,它是利用电流热效应使双金属片受热后弯曲,通过联动机构使触点动作的自动电器。图1-23是热继电器的结构及图形符号。
它由发热元件、双金属片、触点及一套传动和调整机构组成。发热元件是一段阻值不大的电阻丝,串接在被保护电动机的主电路中。双金属片由两种不同热膨胀系数的金属片辗压而成。图中所示的双金属片,下层一片的热膨胀系数大,上层的小。当电动机过载时,通过发热元件的电流过整定电流,双金属片受热向上弯曲脱离扣板,使常闭触点断开。由于常闭触点是接在电动机的控制电路中的,它的断开会使得与其相接的接触器线圈断电,从而接触器主触点断开,电动机的主电路断电,实现了过载保护。
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